Fenris, also known as Fenrir, is a monstrous wolf from Norse mythology. He is the son of the god Loki and the giantess Angerboda. Fenris is known for his immense size and strength, and he plays a significant role in the events of Ragnarök, the end of the world in Norse beliefs. In the myths, the gods feared Fenris due to a prophecy that he would kill Odin, the chief god. To prevent this, they bound him with a magical chain called Gleipnir. Despite their efforts, Fenris eventually breaks free during Ragnarök, fulfilling the prophecy and bringing chaos to the world.